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Simplify the Translog constructor by always expecting an existing translog #28676

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merged 10 commits into from
Feb 15, 2018
Merged

Simplify the Translog constructor by always expecting an existing translog #28676

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e0e2fc6
simplify translog opening
bleskes Feb 12, 2018
5d4b52a
lint
bleskes Feb 12, 2018
ef177d4
fix testDifferentHistoryUUIDDisablesOPsRecovery
bleskes Feb 12, 2018
cd38a05
fix 20_translog.yml
bleskes Feb 13, 2018
28802ed
eol
bleskes Feb 13, 2018
606dc97
eol2
bleskes Feb 13, 2018
177ae4a
20_tanslog.yml take 2
bleskes Feb 13, 2018
3aa0eee
Merge remote-tracking branch 'upstream/master' into translog_simplify…
bleskes Feb 13, 2018
edaddbe
fix docs
bleskes Feb 14, 2018
54932ee
Merge remote-tracking branch 'upstream/master' into translog_simplify…
bleskes Feb 14, 2018
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2 changes: 1 addition & 1 deletion docs/reference/indices/flush.asciidoc
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,7 @@ which returns something similar to:
"translog_uuid" : "hnOG3xFcTDeoI_kvvvOdNA",
"history_uuid" : "XP7KDJGiS1a2fHYiFL5TXQ",
"local_checkpoint" : "-1",
"translog_generation" : "1",
"translog_generation" : "2",
"max_seq_no" : "-1",
"sync_id" : "AVvFY-071siAOuFGEO9P", <1>
"max_unsafe_auto_id_timestamp" : "-1"
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18 changes: 11 additions & 7 deletions rest-api-spec/src/main/resources/rest-api-spec/test/indices.stats/20_translog.yml
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Expand Up @@ -15,7 +15,7 @@ setup:
- do:
indices.stats:
metric: [ translog ]
- set: { indices.test.primaries.translog.size_in_bytes: empty_size }
- set: { indices.test.primaries.translog.size_in_bytes: creation_size }

- do:
index:
Expand All @@ -27,9 +27,11 @@ setup:
- do:
indices.stats:
metric: [ translog ]
- gt: { indices.test.primaries.translog.size_in_bytes: $empty_size }
- gt: { indices.test.primaries.translog.size_in_bytes: $creation_size }
- match: { indices.test.primaries.translog.operations: 1 }
- gt: { indices.test.primaries.translog.uncommitted_size_in_bytes: $empty_size }
# we can't check this yet as creation size will contain two empty translog generations. A single
# non empty generation with one op may be smaller or larger than that.
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nit: indentation

# - gt: { indices.test.primaries.translog.uncommitted_size_in_bytes: $creation_size }
- match: { indices.test.primaries.translog.uncommitted_operations: 1 }

- do:
Expand All @@ -39,9 +41,10 @@ setup:
- do:
indices.stats:
metric: [ translog ]
- gt: { indices.test.primaries.translog.size_in_bytes: $empty_size }
- gt: { indices.test.primaries.translog.size_in_bytes: $creation_size }
- match: { indices.test.primaries.translog.operations: 1 }
- match: { indices.test.primaries.translog.uncommitted_size_in_bytes: $empty_size }
## creation translog size has some overhead due to an initial empty generation that will be trimmed later
- lt: { indices.test.primaries.translog.uncommitted_size_in_bytes: $creation_size }
- match: { indices.test.primaries.translog.uncommitted_operations: 0 }

- do:
Expand All @@ -59,7 +62,8 @@ setup:
- do:
indices.stats:
metric: [ translog ]
- match: { indices.test.primaries.translog.size_in_bytes: $empty_size }
## creation translog size has some overhead due to an initial empty generation that will be trimmed later
- lte: { indices.test.primaries.translog.size_in_bytes: $creation_size }
- match: { indices.test.primaries.translog.operations: 0 }
- match: { indices.test.primaries.translog.uncommitted_size_in_bytes: $empty_size }
- lte: { indices.test.primaries.translog.uncommitted_size_in_bytes: $creation_size }
- match: { indices.test.primaries.translog.uncommitted_operations: 0 }
19 changes: 12 additions & 7 deletions server/src/main/java/org/elasticsearch/index/engine/InternalEngine.java
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Expand Up @@ -480,13 +480,18 @@ private void recoverFromTranslogInternal() throws IOException {
private Translog openTranslog(EngineConfig engineConfig, TranslogDeletionPolicy translogDeletionPolicy, LongSupplier globalCheckpointSupplier) throws IOException {
assert openMode != null;
final TranslogConfig translogConfig = engineConfig.getTranslogConfig();
String translogUUID = null;
if (openMode == EngineConfig.OpenMode.OPEN_INDEX_AND_TRANSLOG) {
translogUUID = loadTranslogUUIDFromLastCommit();
// We expect that this shard already exists, so it must already have an existing translog else something is badly wrong!
if (translogUUID == null) {
throw new IndexFormatTooOldException("translog", "translog has no generation nor a UUID - this might be an index from a previous version consider upgrading to N-1 first");
}
final String translogUUID;
switch (openMode) {
case CREATE_INDEX_AND_TRANSLOG:
case OPEN_INDEX_CREATE_TRANSLOG:
translogUUID =
Translog.createEmptyTranslog(translogConfig.getTranslogPath(), globalCheckpointSupplier.getAsLong(), shardId);
break;
case OPEN_INDEX_AND_TRANSLOG:
translogUUID = loadTranslogUUIDFromLastCommit();
break;
default:
throw new AssertionError("Unknown openMode " + openMode);
}
return new Translog(translogConfig, translogUUID, translogDeletionPolicy, globalCheckpointSupplier);
}
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159 changes: 82 additions & 77 deletions server/src/main/java/org/elasticsearch/index/translog/Translog.java
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48 changes: 25 additions & 23 deletions server/src/test/java/org/elasticsearch/index/engine/InternalEngineTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -109,8 +109,8 @@
import org.elasticsearch.index.mapper.RootObjectMapper;
import org.elasticsearch.index.mapper.SeqNoFieldMapper;
import org.elasticsearch.index.mapper.SourceFieldMapper;
import org.elasticsearch.index.seqno.ReplicationTracker;
import org.elasticsearch.index.seqno.LocalCheckpointTracker;
import org.elasticsearch.index.seqno.ReplicationTracker;
import org.elasticsearch.index.seqno.SequenceNumbers;
import org.elasticsearch.index.shard.IndexSearcherWrapper;
import org.elasticsearch.index.shard.ShardId;
Expand Down Expand Up @@ -1021,25 +1021,25 @@ public void testCommitAdvancesMinTranslogForRecovery() throws IOException {
}

engine.flush();
assertThat(engine.getTranslog().currentFileGeneration(), equalTo(2L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(inSync ? 2L : 1L));
assertThat(engine.getTranslog().getDeletionPolicy().getTranslogGenerationOfLastCommit(), equalTo(2L));
assertThat(engine.getTranslog().currentFileGeneration(), equalTo(3L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(inSync ? 3L : 2L));
assertThat(engine.getTranslog().getDeletionPolicy().getTranslogGenerationOfLastCommit(), equalTo(3L));

engine.flush();
assertThat(engine.getTranslog().currentFileGeneration(), equalTo(2L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(inSync ? 2L : 1L));
assertThat(engine.getTranslog().getDeletionPolicy().getTranslogGenerationOfLastCommit(), equalTo(2L));

engine.flush(true, true);
assertThat(engine.getTranslog().currentFileGeneration(), equalTo(3L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(inSync ? 3L : 1L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(inSync ? 3L : 2L));
assertThat(engine.getTranslog().getDeletionPolicy().getTranslogGenerationOfLastCommit(), equalTo(3L));

globalCheckpoint.set(engine.getLocalCheckpointTracker().getCheckpoint());
engine.flush(true, true);
assertThat(engine.getTranslog().currentFileGeneration(), equalTo(4L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(4L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(inSync ? 4L : 2L));
assertThat(engine.getTranslog().getDeletionPolicy().getTranslogGenerationOfLastCommit(), equalTo(4L));

globalCheckpoint.set(engine.getLocalCheckpointTracker().getCheckpoint());
engine.flush(true, true);
assertThat(engine.getTranslog().currentFileGeneration(), equalTo(5L));
assertThat(engine.getTranslog().getDeletionPolicy().getMinTranslogGenerationForRecovery(), equalTo(5L));
assertThat(engine.getTranslog().getDeletionPolicy().getTranslogGenerationOfLastCommit(), equalTo(5L));
}

public void testSyncedFlush() throws IOException {
Expand Down Expand Up @@ -2611,9 +2611,11 @@ public void testRecoverFromForeignTranslog() throws IOException {
Translog.TranslogGeneration generation = engine.getTranslog().getGeneration();
engine.close();

final Path badTranslogLog = createTempDir();
final String badUUID = Translog.createEmptyTranslog(badTranslogLog, SequenceNumbers.NO_OPS_PERFORMED, shardId);
Translog translog = new Translog(
new TranslogConfig(shardId, createTempDir(), INDEX_SETTINGS, BigArrays.NON_RECYCLING_INSTANCE),
null, createTranslogDeletionPolicy(INDEX_SETTINGS), () -> SequenceNumbers.UNASSIGNED_SEQ_NO);
new TranslogConfig(shardId, badTranslogLog, INDEX_SETTINGS, BigArrays.NON_RECYCLING_INSTANCE),
badUUID, createTranslogDeletionPolicy(INDEX_SETTINGS), () -> SequenceNumbers.NO_OPS_PERFORMED);
translog.add(new Translog.Index("test", "SomeBogusId", 0, "{}".getBytes(Charset.forName("UTF-8"))));
assertEquals(generation.translogFileGeneration, translog.currentFileGeneration());
translog.close();
Expand Down Expand Up @@ -2835,7 +2837,7 @@ public void testCurrentTranslogIDisCommitted() throws IOException {
globalCheckpoint.set(engine.getLocalCheckpointTracker().getCheckpoint());
expectThrows(IllegalStateException.class, () -> engine.recoverFromTranslog());
Map<String, String> userData = engine.getLastCommittedSegmentInfos().getUserData();
assertEquals("1", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals("2", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals(engine.getTranslog().getTranslogUUID(), userData.get(Translog.TRANSLOG_UUID_KEY));
}
}
Expand All @@ -2846,14 +2848,14 @@ public void testCurrentTranslogIDisCommitted() throws IOException {
assertTrue(engine.isRecovering());
Map<String, String> userData = engine.getLastCommittedSegmentInfos().getUserData();
if (i == 0) {
assertEquals("1", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals("2", userData.get(Translog.TRANSLOG_GENERATION_KEY));
} else {
assertEquals("3", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals("4", userData.get(Translog.TRANSLOG_GENERATION_KEY));
}
assertEquals(engine.getTranslog().getTranslogUUID(), userData.get(Translog.TRANSLOG_UUID_KEY));
engine.recoverFromTranslog();
userData = engine.getLastCommittedSegmentInfos().getUserData();
assertEquals("3", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals("4", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals(engine.getTranslog().getTranslogUUID(), userData.get(Translog.TRANSLOG_UUID_KEY));
}
}
Expand All @@ -2862,10 +2864,10 @@ public void testCurrentTranslogIDisCommitted() throws IOException {
{
try (InternalEngine engine = new InternalEngine(copy(config, EngineConfig.OpenMode.OPEN_INDEX_CREATE_TRANSLOG))) {
Map<String, String> userData = engine.getLastCommittedSegmentInfos().getUserData();
assertEquals("1", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals("2", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals(engine.getTranslog().getTranslogUUID(), userData.get(Translog.TRANSLOG_UUID_KEY));
expectThrows(IllegalStateException.class, () -> engine.recoverFromTranslog());
assertEquals(1, engine.getTranslog().currentFileGeneration());
assertEquals(2, engine.getTranslog().currentFileGeneration());
assertEquals(0L, engine.getTranslog().uncommittedOperations());
}
}
Expand All @@ -2875,11 +2877,11 @@ public void testCurrentTranslogIDisCommitted() throws IOException {
for (int i = 0; i < 2; i++) {
try (InternalEngine engine = new InternalEngine(copy(config, EngineConfig.OpenMode.OPEN_INDEX_AND_TRANSLOG))) {
Map<String, String> userData = engine.getLastCommittedSegmentInfos().getUserData();
assertEquals("1", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals("2", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals(engine.getTranslog().getTranslogUUID(), userData.get(Translog.TRANSLOG_UUID_KEY));
engine.recoverFromTranslog();
userData = engine.getLastCommittedSegmentInfos().getUserData();
assertEquals("no changes - nothing to commit", "1", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals("no changes - nothing to commit", "2", userData.get(Translog.TRANSLOG_GENERATION_KEY));
assertEquals(engine.getTranslog().getTranslogUUID(), userData.get(Translog.TRANSLOG_UUID_KEY));
}
}
Expand Down Expand Up @@ -4421,7 +4423,7 @@ public void testOpenIndexCreateTranslogKeepOnlyLastCommit() throws Exception {
assertThat(userData.get(SequenceNumbers.LOCAL_CHECKPOINT_KEY), equalTo(lastCommit.get(SequenceNumbers.LOCAL_CHECKPOINT_KEY)));
// Translog tags should be fresh.
assertThat(userData.get(Translog.TRANSLOG_UUID_KEY), not(equalTo(lastCommit.get(Translog.TRANSLOG_UUID_KEY))));
assertThat(userData.get(Translog.TRANSLOG_GENERATION_KEY), equalTo("1"));
assertThat(userData.get(Translog.TRANSLOG_GENERATION_KEY), equalTo("2"));
}
}

Expand Down
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